Pobated



I. N. REYNOLDS AND I. F. HEARN.

TELiPHONE SWITCHING APPARATUS. APPUCATION FILED IAN. 8.19"!- 1 1 Patented Aug. 26, I919,

2 shins-shin 2.

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i! IIIIIIIIP'L //7 yen/ara- Jofin A ewfierry Reyna/dis. Jofin Hear/7.

UNITED STATES PATENT OFFICE.

oan Nnwnnaar R YNOLDS, or slsrm'wrcn; C N an mm s. new, or PASSAIC, new .rnnsnr, sssxenons '1 O wnsrnnn nnnc'rnrc comrm moonronarnn, or new roux, n. Y., A conronn'rron or new roan.

TELEPHONE SWITGHING APPAMTUS.

Specification of Letters Patent.

Patented Aug. 26, 1919.

Application filed January 8. 1018;. Serial No. 810,862.

Tamil-whom itma concern:

Be it known t at we, Joan Nmwnmil Burrows and Jonas F, Hum, citizens of the United States, residing at Greenw ch, in the county of Fairfield, State of Connecticut, and at Passaic Passaic, State of New Jersey, respectively, have invented certain new and useful I-mprovements in Telephone Switching Apparatus, of which the following is a full, clear, concise, and exact description.

This invention, relates to automatic switching mechanism for telephone exchange systems, and pertains more particularly to the provision of a switch forthis purpose consisting of an organization as parts, compactly arranged, and wiper-sting in such memerfthat a'comparativ y large number of lines or connecting circuits may be efliciently served with the speed and accuracy necessary in i-the operation of systoms of this character-,1

he s itch construction wherein the principles of the present invention are embodied resembles the type of selective switch do scribed and claimed in an application of J. N. Reynolds, Serial No. 158,190, filed March 29, 1917, inasmuch as there is dis closed in said application a switch having its contacts arranged in multiple layers in superimposed relati n to each other, In that pplications. set of movable contacts or 'brushes is mounted upon a shaft in 006pez'ativc relation to the multiple layers, and by means of switch-operating devices? is adapted to 'be elevated, together with the shaft, into a position opposite any one of said multiple contact layers. Thereupon the necessary electrical and mechanical changes are efi'ected, and by a further operation of the switchmperating devices; the brush set is moved, independently of and at rightangles to the brush shaft, to s'ucces si-ve'ly engage the contacts of the selected layer.

Morc'particularly, however, the present invention is in the nature of an improvement of .the specific type of switch shown in an application to J. N. Reynolds, Serial No. 199,862, filed November '2, 1917. The switch disclosed in this last mentioned application is specially designed to serve a comparatively large number of lines, as for example, 500 or 14900. To this end the marl in the county 'Qf tiple contact layers or strips are divid d nto a plurality of sections each section being conveniently arranged to include the multiple contacts of 100 lines or trunks. A set of movable contacts is rovided for each sectionand ismounted or sliding movement upon brush carriages. These carriages are securely fastened to a hollow shaft, with in which there is a brush controllin shaft adapted. for both rotary and, longitudinal movements relative to said hollow shaft. A rotary stepping magnet is provided for the purpose of rotating the brush controlling shaft relative to the hollow shaft when the series of impulses is directed to the switch, vThis operation results in the piedeterminstion of the particular set oi brushes to be employed in extending the connection. The second series of impulses functions t operate a wertical ste p magnet to; elevate both-the hollow sha aid the brush controlling sharft into such position that the .selsctetl'set oxE brushes are broughtinto' proper relation with the desired layer of contacts, Finally, the last set of impulses operates the vertical stepping magnet to elevate the controlling shaft independently of the hollow lomsh shaft. This results in causing the selected set of brushes to be thrust in a horizontal movement over the multiple contacts of the level.

In accordance with the primary object of the present invention, a selective swltch of the above described character, having a. capacity her 500 or more lines, is so arranged and organized that but one stepping magnetic required to impart the necessary movements to the movable contacts.

A feature of the invention consists in the provision of a sidees witch magnet, which, besides its usual flm-ctions oil? preparing the operating circuits of the switch in the proper sequence, also-operates to brin about a 'l'lllmbfil' ct changeslin the mechamcal re lation' of severe-'1 of the'switch parts. By this expedient, certain changes are caused in the cooperation ofthe actuating members, which contnol the-movement of the brushes, such that the stepping magnet, having per! formed one operation in ones to aseries of impulses, may respon to succeeding series of impulses to perform other opera tions upon the brush contmollin mechanism 'lfliis'novel manner of cont ing the me chanical change-over functions of the switch enables the stepping magnet to accomplish three separate selections.

Another feature resides in the arrangement of means whereby a brush controlling member is moved longitudinally under three distinct and separate conditions, each of these movements being effective in a different selective operation of the switch.

Still another feature is the provision of means whereby the movable contacts of the switch are'advanced by steps of one characten during two selective operations, and thereupon caused to move in the third selective operation by steps of a different character.

Other and further objects will become more thoroughly understood from the following description, reference being-had to the accom anying drawings, in which Figure 1 is an e evation of a portion of the switch showing the operating devices; Fig. 2 is an elevation of the upper part of the brush shaft, illustrating the method of mountmg the brushes in relation to the sections of multiple terminal strips; Fig. 3 is an enlarged detail of a section taken longitudinally of the brush shaft showing the arrangement of the brush selecting device, and Fig. 4 is an enlarged view in pers ective of the mechanism' for bringing a cut the mechanical change-over operations during the actuaticnof the switch.

' ran ed in-sections of 100 as s own in Fig.

2. pon being taken for use in extending a telephone connection, the brush-operating mechanism of this switch actuates in response to the first set of impulses to choose the particular set of brushes allotted to the desired section. In response'to the second series of impulses all brush sets are moved vertically until the chosen set is operatively positioned with respect to the desired group or strip of terminals in the section, and finally the set of brushes thus positioned is caused to move transversely to connect with the required set of terminals in the strip. Referring to the drawings, 1 designates the mainframe and sup orting plate of the switch; which carries t e two guiding'brack' ets '2 and 3.. A hollow brush shaft 4 is loosely mounted in these brackets soas to be freely movable in a longitudinal direction. Securely fastened to the shaft 4 by means ofscrews 6, 6, are a plurality of brush carri 'e supports 5, 5. To assist in retaining sai carnage supports rigidly in position the '11 per portion 7' thereof is fashioned into t e form of a sleeve-to surround shaft 4. 'Each support 5 is provided with guide rods 8 upon which .is s'lidably mounted a brush carriage 9. ,llhe carriage 9--carries a set of brushes 10, secured thereto as by means of the insulating blocks 11. A re tractile spring 112, one end of which is fastened to the carriage 9 and the other end to the support 5, acts to normally retain the brush carriage in the position shown in the figure.

The terminal bank, which, as hereinbefo stated, may be of the type disclosed in the above mentioned application, Serial No. 158,190, consists of flat strips or layers 12, each com rising a plurality of multlple terminals. hese terminal strips may be of any desired length to ermit access to the multiples thereof by 0t er switches similar to the one shown. In a 500-line switch the strips 12 are arranged in five sections as illustrated in Fig. 2, each section referably containing ten multi le strips. here are also five sets of brus es 10, one allotted to each section of terminal strips, and so arranged on the shaft 4 that, when said shaft is in its normal position, the brush sets 10 are spaced below the lowermost strip 12 of their individual sections by distances which progressivel increase from one section to the next. he object of the arrangement of brushes just described will appear more fully hereinafter. Disposed within the hollow shaft 4 and arranged to extend throughout the entire length thereof, is a brush controlling shaft 13; Shaft 13 is loosely mounted so as to be capable of both rotary and axial movements relative to shaft 4. The upper portion of shaft 13 is rovided with a series of reduced cross sections as clearly illustrated in the detailed showing of Fig. 3. There is one of these reduced cross sections for each set of brushes, and with both the shafts 4 and 13 in their normal restored positions, such cross section occurs just below the brush carriage 5. The shaft 13 is also provided with a series of slots 14, one at each of the reduced sections. These slots are cut through the shaft 13 at different angles and are adapted to be brought into registration with slots 15 in the shaft 4 when said shaft 13 is rotated. The angles of the planes of slots 14 are so arranged that successive and e ual increments of rotation of shaft 13 bn said slots 14 successivel into registration with their correspon ing slots 15 of shaft 4. Mounted in each slot 14, by means of a pivot 16 is a latch lever 17, the lower end of which is provided with a hook 18, and the upper end with the cam surface 19. -With the shafts 13 and 4 in their normal relative position, the lever 17 is retained within the slot 14 as shown in Fig. 3. A more detailed disclosure of'the arrangement and purpose of the slots'in the brush controlling shaft is en in the above-referred-to application, erial No. 199,862. And since the'present inventionis not directed to this particular arratchet wheel M ie seourel 24; mewe c mprising e Plates 2 romeo of the brush woolle th t, 1; it believed unnecessary to give a. more det iled d semptlen thereof- Sec r d to th we plat 1.15 a su port 21, which fastened to each other by scpew 22. Plates 20 and 2 1 are respectively P vided with an 9 eeh ha ing a circ l r hole in he end theni, messed in ertical ahnemen I ramhet wheel}! g. hollow bearing hub 28 whieh is lesrnledte va 'b ei eoo m t brackets 93 and 25- The hub ZS-mey enlarged es shown a 2 v t prevent anal displacement of retehet 27, or as on alternetlve, e split sleeve may be sprung over t hub to serve as a spacing member between said ratchet and the bracket 23. On the other side of bracket 23, e eup'sheped member 30 fits on over the end of bearing hub 28, and is scoured ther to by ,e setscrew 31. The upper or closed 6 .142 9f this cup contains a. aperture P86 66611 in Fig. 4:. Adjacent to, and in axial almoment with hub 28, is a seeondh pw bearing hub 33, said letter hub being wumeled for rotation in the breekets 24: and 26. A fastened to hearing hub 3-3 and is retain against l ngitudinal displacement by the spacing sieeve 35. On the lower end of hub 33, e supi 36 similar to cup 30, 1s fitted end secured y a set screw .37. Cup 36 is likewise provided with a. rectangular aperture 38. A coiled spring 39-is wrapped about the hub 33 with one and fastened to said hub and the other end secured to the bracket 25. Normally this spring is in a, suhstentieliy untensioned condition, but after being wound up by o. clock- Wise rotation of hub 33 it exerts its force to return said hub to normed as soon as the same is released. Mounted upon pivots 4:0 is a. pair of holding dogs 4:1 and 4:2 which rates respectively with ratchet wheels 34 and 27 to'hold the-some in their ndlus'ted positions against the tension oi spring 89. Said dogs 421 end 42 are provided respectively with 4:3 end 4 4, both fastened to a lug es on p ate b0, and the tension of which tends to hold said dogs in engagement with their respective ratchet wheels. These dogs are aiso equipped with anti-iriction rollers &6 and M adopted to be engaged by actuating devices, eswill clearly eppeer hereinefter, to retract the dogs from their holding on ement with ratchets M and 27. The ho ding dogs 41 and 42' are so arranged that dog 42 may "be released without efi'ecting dog 41, but dog 41, when retroeted, nets to release both dogs from their engagement with retchets 34 end 27.

A rectangular strip orbar48 is arranged within the hollow bearing hubs Q8 and .83 and gases loosdy through the apertures 32 and B in the cops 30 and 88 respectively.

. and is secured thereto as The upper end of thisba-r passes into a. slot in the end of the brush controlling shaft 13, by means of rivets 4:9. The hiterme iet i flrtion of the her 43 is given a. uniform twist so that its flat sides form substantially helioel surfer/es. This helical twist is clearly shown at 50 in Fig. 4, and is so arran d in the hollow hub 33 below the slot 32 1n cup 30, when all ports are in normal positi n, that upon an o word movement of shaft 13, the said twisted section of bar 48 will enge the 5101i 39 in oulp 30 to rotate the she. t 1.8. It wiil now e seen that the pitch of this helical portion of bar 48 may be so adjusted that by taking one upward step the shaft 13 is rotated at suflicient distance to bring a slot 14 into registration with a. slot 15 in shaft 4 corresponding to that set of brushes which is allotted to the first section of terminods 1'2. In a like manner two steps place the slots 14 and 15, corresponding to the second set, in registration. It will also be seen that by providing the her 48 with the proger number of turns any desired number of rush sets may be suecessively selected as the twisted portion of said he: passes through the rectangular slot At the lower end of hollow shaft 4 is socured a collar 51 which carries the springhe'ld' owl 52. lhis pawi has a, com surfeee whie is adapted to engage momentarily the anti-friction roller 456 of dog 41 as the shefit 4 drops to its normal position. During the ugward motion of shaft 4, the pawl spring 5 yields to the engagement of pawl 52 with roller 46, permitting said pawl to pass by without actuating dog 41.

Slidably mounted upon the shaft 4, as by means of collars 54 and 55, is a, toothed bar 56. Bar 56 is arranged to be actuated in a vertical direction b a pawl 57, carried by the armature 58 o a step-pin magnet 59. The toothed bar 56 is norms; locked to brush shaft 4 by a. spring-pressed locking member 60. A screw 61 in collar 54 passes through va. slot 62 in shaft 4 and engages va. groove (not shown) in the shaft 13, whereby; said shaft 13 is constrained .to move lon itudinall with bar 56, but may rotate in ependent y thereof. A side-switch magnet 63, through the agency of its annature 64 and pewls 65, 66, is arranged to rotate epeir of com disks 67 and 68 upon each actuation of said magnet. Disk 68 engages roilers 69 to thereby more side-switch arm 70 with its wipers successively over the switch oontaets 71. Gem disk 67 is provided with pins 72, which at certain stages of its rotation ongo a lever 73 to thereby withdraw the holding dog 42 from mtehetfl'f. 67 at its perl ery is so shaped that by-enga. ment with roller 74 on the member 75 e toothed bar 56 is unlocked from shaft 4, the stepping stroke of armature 58 1s altered,

regstered, are maintained so durin the seeon' selective operation of the switch apparatus. The selected brush set 10 is now resting in operative relation to the multiple layer 12, of the second hundreds group, corresponding to the number of impulses sent to magnet 59 in the second series. Sideswitch magnet 68 again doiincrgizes and passes the side switch to position 3. Bots-.- tion of the cam disk 67 now brings one of its eripheral surfaces into en' agement with rel or 74, which rotates mom or 75 to unlock the toothed bar 56 from shaft 4 and in turn locks said shaft 42 to the switch frame. This movement of member 75 also prepares for a change-over iii the operation of the stepping magnet annature from long to short steps. As referred to, these teatures are all well explained" in the above mentioned ap lieation Serial No. 199,862. The pin 72 of the cam 67, which operated the lever 73 when the side switch took its first step, still retains said lever actuated after the side switch has advanced a second step. The curved end 76 of lever 73 permite of this action, and the reason therefor will be taken up later in the description. Upon the third and final series of pulses being sent to the switch, ma et 59 vibrates its annature 58, and the pew 57 in response thereto, steps the liar 56 up a distano'e equal to two teeth for the first impulse of such series. The shaft 4 which is now unlocked from toothed bar 56 and locked to the switch frame holds the selected set of brushes 10 accurately positioired with respect to the selected layer 12 in the section. Therefore, the bar 56 by upward under these conditions carrise with it only the brush controlling shaft 1:8. The shaft 13 by moving relwti-veiy to shaft 4: causes the cam slit-face 1 9 of latch lever 17 to engage screw 6, Fig. 3, with which it is now in vertical alinemeiit, to thereby swing the lever 17 out through the slots in Shift 13 and Shaft 4. The hook 18 slice the bell-crank lever 77 whichin imparts a'horizontal' move ment to the brush carriage 9 assoeiawd brmh m 'llnis, at the end of the EM impulse of the third series the shaft 13 is vertically one long step the brdsh Iatehing mechanism is operated and the costs set of brushes 1c is mad into we feet with the first set of multiple no-19in the selected ltiyer 12. Therenpon, as previously referred to, the ehange over operation occurs to limit the strokebf'arnm 5811c corresponding to a; single tooth of the bar 56, so that the remaining impulses of the series operate to advance the brush set 10 in short stars trom' one termfihil seem the next unti proper set is finally remh'ed. The side thehmovw forwerd into position it The com diik .67 does not alter the position of member 75, but pin 72 new escapes'the hooked end of lever 73, permitting said lever to restorc and the 42 to reengage ratchet wheel 27- When it is desired to restore the switch to normal position, side-switch magnet '63 is energized and automaticall steps the sideswitch cams 67 and 68 an arm 70 around to osition 8.. The cam 67 i so fashioned that upon passing to position 8, it engages the roller 74 to rotate member 75in the opposite direction from that caused when said cam took its second step. This movement of member 75 serves to release the toothed bar 56, which drogs with the shaft 13 toward the normal positlon. Downward motion of shaft 13 causes the brushcarriage to be withdrawn, assisted by spring 112, and also returns the latch lever 17 within its recess in shaft 13. When the toothed bar 56 drops sufiiciently to bring it into its normal position relative to the shaft 4:,the locking member 60 unlocks shaft 4 from the switch frame, and looks it to the bar 56. Thereupon, both shafts 4 and 13 return to their normal restored position. Just before reachin' this position, however, the cam surfaceo pawl 52 cos roller *6 to momentaril with draw both do'gsfl and 452. from thenholdingrclation with mtohets 34: and 957. The spring 39, which was tensioned during" the operation of the switch, immediately restores the hub bearing 33 and ratchet 34 back to normal and in so doing, rotatively restores the twisted bar. i8 and shaft 13 to At this time, the magnet 63 is given its final energination, which arts to return the side switch to its first, sition and places cams 67 and 6-8- in conditionv to perform another cycle of operations. All parts of the switch are thus in their normal position.

Considering again the operation of the novel mechanism herein disclosed for tramsforming a linear steppilif motion into a retary one forte acting piirpbses, a further description will now be 'ven of the necessity retaining the be up dog mt pose .another specifie in is seemed, m which simiination of comlrrising; all three S6- of selective inipuises is less than sin.

Thisnbcu'rs, for example, when connection is desired with the first set of mnltiyle terminals iii the first layer of the first section oi .190 lines, in which case but three imiaulses afeneeessary to efieettli'e connection.

n this case only i of thetwisted porticn50 of bar 48 passes through the slot 32 in 1330 during the first two selective movements of theswitchi Cdnsequeiltly, in orderxthat the renikining, oi the twist 59 with not sai ' produce rotation of shaft 13 and thereby throw slots 14: and 15 out of registration during the third selective movement, it is necessary tohold the ratchet 27 unlocked durit may readily be adapted to switches of an desired size.

hat isclaimed is: 1. The combination in a switch, of'a con tact-bank arrangedin sections and groups, a-brush shaft, an auxili shaft said shafts being arranged tonne a vance simultaneously in two separate selective movements to select firsta section and then a group of contacts in said section, said auxiliary shaft being arranged for further movement to select a set of contacts in the group, and means for operating said shafts.

2. The combination in a switch, of a con tact bank arrangedin sections and groups, a brush shaft, an auxiliary shaft, said shafts being arranged to be advanced simultaneously in two separate longitudinal unovements to select first a section and then. a

roup of contacts in said section, said auxiliar shaft being arranged *for further lon ltudinal movement independently of 5, brush shaft to select aset of contacts in the group, and means for operating said shafts. i 1

3. The combination in a switch, of a contact bank arranged in sections and groups, a hollow brush shaft, an auxiliary shaft within said hollow shaft, saidshafts being arranged to be advanced simultaneously in two'separate selective movements to select first a section and then a cup of contacts in said section, said auxi iary shaft being arranged for further movement to select a operating said shaftsfiaf r '4 The combination a switch, of -a contact bank arranged in-"seotions'and groups, a hollow br'ush shaft, an auxiliary sha saidhollow shaft, said gshafts being arranged to be advanced simultaneously: in two separate longitudinal movementsto select first a section and then a group of contacts in said :sectibmsaid auxiliary shaft being arranged for further lo-n itudinal movement independently of sai hollow start e) "select a set ofcontacts' in the group, and means for-operating said shafts.

5 "The combination in a switch; of aicontact' bank arranged in sections and groups, a brush shaft, an auxiliar shaft, said shafts being arranged to be a vanced simultaneously in-two separate selective movements to seiect first a sectioncand then a group of contacts in said section, said auxiliary set of'contants infthe group,-- and means for woman shaft being arranged for further movement to select 'a set of contacts: inv the grd'upjand a single magnet for operatingcsaid shafts.

;6. The combination in a switch,..0f a contact bank arranged in sections and groups, a brush shaft, an auxiliary shaft-,said shafts being arranged to be advanced simultaneously by long steps in two separate selective movements to select first a section and then a group of contacts in said section,.

said auxiliary shaft being arranged to be further advanced by short steps to select a set of contacts in the selected group, and a singic stepping magnet for operating said shafts. 1

7. The combination in a switch, of anontact bank arranged in sections and groups, a brush shaft, an auxiliar shaft, said shafts being arranged to be a 'vanc'ed simultaneously by long steps in two separate movements to select first a section and thenza group of contacts in said section, said auxiliary shaft being arranged to be further advanced by short stepsto select a set of contacts in the selected group, means for changing the operation of the auxiliary shaft from long to short steps, and a 'si' le stepping .magnetlfor actuating said sha ts.

8. The combination in a switch, of a contact banks arranged in; sections and groups,

a' hollow' brush shaft,- an auxiliary shaft within said hollow shaft, said shafts being arranged to be advanced simultaneousl by long steps in twoseparate lon'gitu inal movements to select first a-section and then a group of contacts in said. section, said auxiliary shaft bein arranged to be further advanced longitudinally by short steps and independently of said hollow shaft tor select a set of contacts in the selected group, a controlling magnet for changing the operation of said auxiliary shaft from long'steps vto short steps, and-a single stepping magnet for actuating said shafts:

9. In a switch,- a contact bank comprising a plurality of sections, each section comprising superimposed .unit la ers, each layer comprisinga' group of mu-tiple contacts, a brush shaft, an auxiliary shaft, said shafts being arrangedto be 'advanced simultaneously .in two separate vertical movements :to select first a section andlithen a grou of ctntacts in said section, said: auxiliary sft being arranged toagain move vertica ly and independently of said brush shaft to select a' set 'of ,I-nultiple contacts in the selected group, and a single magnet for operating saidishafts; r

- ,10. ]in a switch, a contact; comprising a plurality of sections, each section comto beadvanced simultaneously in me separate vertical movements to select first a section and then a rou of contacts in said section, said auxiliary's aft being arranged for further vertical movement inde endently of saidhollow shaftto select a mu tiple contact in the selected group, mechanical means for controlling the operation of said shafts, and a stepping magnet for operating said shafts. j

11. a switeaa contact bank arranged in sections and grim" "s, a brush shaft, an auxiliary shaft, means or moving simultaneouly said amen shes lea mumm and said auxiliar shaft longitu inally and rotatively to selcif one of said sections means for simultaneously moving both shafts longitiidinally to select a groupin the selected section, an means for movin said auxiliary shaft fngitudinally wee ect a contact in the seect d roups.

'12}. Ina switch, a contactb'a'nk arranged in sections and oulps',a hollow brush shaft, an auxiliary shaft within said hollow shaft, means for movin simultaneously said hollow shaft l on it ina'lly and said auxiliary shaft retest-ai to select one of said sections, meal-nice eimu'nane un moving both shafts iengiteemany select a soup of contacts in the selected section, an means fer moving'said auxil ary shaft 16 "itud'inally to select a contact in the selecte roup.

-13. Iln-aswitch, a contact bank rranged in sections and greups, abrusn s aft, an

auxiliary shaft, means for longitudinally adva cingsaid, shafts together by long steps and for simultaneously advancing sa1daux iliary shaft rotatively to select one of said sections, means for advancing both shafts longitudinally by long steps to select a group of contacts in the selected section and means for again advancing said auxiliary shaft longitudinal] by short steps to select a contact in the se ected group.-

14. In a switch, a contact bank arranged in sections and groups, a hollow brush shaft, an auxiliary shaft within said brush shaft, means for advancing said shafts in unison longitudinally by long steps and for simultaneously rotating said auxiliary shaft to select one of said sections, means for advancing both shafts longitudinally by long steps to select a group of contacts in the selected section, and means for advancing said auxiliary shaft longitudinally independently of said brush shaft to select a contact in the selected group.

15. In a switch, a frame, a brush shaft and an auxiliary shaft mounted upon said frame, means for advancing both shafts longitudinally in a first selective movement, mechanism for imparting rotation to the auxiliar shaft during said movement, means for a vancing both shafts longitudinally in a rotation to the auxlhzty shaft during ear movement, means for vancing both shafts vertically in a second selective movement, mechanism for thereupon locking said brush shaft to the switch frame, means for again advancing said auxiliary shaft vertically and independently of saidbrush shaft, and a magnet for controlling both of said mechanisms.

17. In a witch, a brush shaft, an auntiliary shaft, means for advancing both shafts longitudinally by steps of one character in a first selective movement, mechanism for imparting rotation to the auxiliary shaft simultaneously with its longitudinal movement, means for again advancing both shafts longitudinally by steps of the sane characterm a second selective movement, mechanism for thereupon locking said brush shaft against further movement, means for egeinedvancing said auxiliary shaft longltudlnall by steps of a different character In a thir selective movement, mechanism for changing the operation of the auxiliary shaft from steps of one. character to steps of the other character, and a single magnet for actuating each of said mechanisms.

18. In a switch, a hollow brush shaft, an auxiliary shaft within said brush shaft, said shafts being normally locked against relative longitudinal movement, means for advancing both shafts longitudinally by long steps in a first selective movement, mechanism for imparting rotation to the auxiliary shaft simultaneously with its longitudinal movement, means for again advancing both shafts longitudinally b long steps in a sec ond selective movement, mechanism for thereupon unlocking said shafts and for locking said brush shaft against further movement, means for again advancing said auxiliary shaft by short steps in a third selective movement, mechanism for changing the o eration of the auxiliary shaft from long to s ort steps, and a magnet for actuating all of said mechanisms.

19. In a switch, a contact bank arranged in sections and cups, a hollow brush shaft, an auxiliary s aft mounted within said brush shaft for rotar and longitudinal movements relative t ereto, a helically vshaped member secured to said auxiliary shaft, a locking device for normally locking said shafts against relative longitudinal movement, means for moving said shafts 'lon itudinally, mechanism coiiperating'with sai helical member to impart rotationto said auxiliary shaft simultaneous with said longitudinal movement to select one of said ,sections means for again moving said shafts 'lpn itudinally toselect a roup of contacts in gm selected section, me anism for thereactuatinig said lockingdeviceto unlock sla-id shafts from each ,othe r', and to lock the shaft against further movement, me s for a ainmoviing said auxiliary shaft longitudina ly ,to'select a contactinf'the se- Ilected fgrou'p, and a magnet for controlling bo h 0 a d e hani ms 1 20. In; a switch, a contactbank arranged injsections, each section comprising a plurality of layers, each-layer comprising a group of multiple contacts, a brush shaft, a plurality of brushes mounted thereon, one for each of said sections, an auxiliary shaft, means for moving both shafts vertically and, for simultaneously rotating the auxilairy; shaft to select one of said brushes and togpositior the selected brush in operative relation to its individual section, means for in moving both shafts vertically to position said brush in operativer'elation 20 a 30 group of contacts in the section, andnieans fori algain' moving"the auxiliary shaft-jverticlalljfto move said ,brush over' the contacts of ';the selected group.

fZL'In a s itch frame, a brush shaft and an auxiliary shaft mounted upon said frame, meansfor advancing both shafts longitudinally in a first selective movement, mechanisms for imparting rotation to the auxiliary shaft during said movement, means for again advancing both shafts longitudinally in a second selective movement, mechanism for thereupon locking said brush shaft to the switch frame, means for again advancing the auxiliary shaft longitudinally in a third selective movement, mechanism for releasing said shafts, and a single electromechanical device for controlling all of said mechanisms I 22. In asvvitch, a lorush'shaft, an auxiliary shaft, ineansfor advancingboth shafts longitudinally "by long steps in a first selective movement, mechanism for simultaneou'sly imparting rotation to the auxilia shaft, means or again advancing bot shafts longitudinally by long steps in a second selective movement, mechanism for thereupon locking said brush shaft a ainst further movement, means for again a Vancing the auxiliary shaft longitudinally by short steps in a third selective movement, mechanism for changing the operation of the auxiliary, shaft from longsteps to short ste s, mechanism for releasing said, shafts an a singlemagnet for controlling all 0 said mechanisms. Y In jvvitness whereof, we hereunto subscribe our' znainesthis 31st day of December A. D., 191 v JOHN NEWBERRY REYNOLDS.

JOHN F. HEARN.

Oopies of this patentinay be bhta'ined for five cents each, by addressing the Commissioner. of Patents,

i Washington, D. 0. 

